prohibition

... To this end the following acts are and shall remain prohibited at any time and in any place whatsoever with respect to the above-mentioned persons: ...

... Prisoners of war must at all times be humanely treated. Any unlawful act or omission by the Detaining Power causing death or seriously endangering the health of a prisoner of war in its custody is prohibited, and will be regarded as a serious breach of the present Convention. In particular, no prisoner of war may be subjected to physical mutilation or to medical or scientific experiments of any kind which are not justified by the medical, dental or hospital treatment of the prisoner concerned and carried out in his interest. ...

... Measures of reprisal against prisoners of war are prohibited. ...

... Collective disciplinary measures affecting food are prohibited. ...

... Any prohibition of correspondence ordered by Parties to the conflict, either for military or political reasons, shall be only temporary and its duration shall be as short as possible. ...

... Representatives and delegates of the Protecting Powers shall have full liberty to select the places they wish to visit. The duration and frequency of these visits shall not be restricted. Visits may not be prohibited except for reasons of imperative military necessity, and then only as an exceptional and temporary measure. ...